Dialogic® 4000 Media Gateway Series Reference Guide
page 31
Global Security Parameters
Supported cipher levels:
Cipher is an algorithm for encrypting and decrypting data. During the SSL
handshake between client and server, the cipher level is negotiated. A low cipher
level should only be used for systems that do not transmit any important
information.
High
: This currently means cipher suites with key lengths larger than 128 bits,
and some with 128-bit keys.
Medium
: Currently some suites using 128-bit encryption.
Low
: Currently suites using 64- or 56-bit encryption algorithms but excluding
export cipher suites.
Authentication mode:
Select how the server-client authentication should be handled.
Mutual Authentication
: MTLS is used by Microsoft
®
Office Communications
Server (OCS) 2007 Server roles and by Microsoft
®
Exchange 2007 UM role to
communicate with each other. In this mode, both peers need to authenticate each
other and both client and server exchange certificates.
For connecting to Microsoft
®
OCS 2007 R2 Mediation Server via TLS, use Standard
TLS authentication mode. For a direct connection to Microsoft
®
Exchange 2007
UM role via TLS, use MTLS authentication mode.
Standard TLS Authentication
: This is the normal authentication mode, in which
the client asks the server for authentication to ensure a secure connection to the
correct server.
No Authentication
: In this mode, neither the server nor the client need to proof
its authentication.
The default setting is:
Standard TLS Authentication
.
Certificate date verification:
If enabled, the expiration date of the peer certificate is verified. If the certificate
is expired, an informational message is displayed and the call is aborted.
